But there is this sort of sense of uncertainty that you see in someone like Descartes, who finally just goes back to basics and says, "I think, therefore I am."

你可以在那个年代从某些人身上,看到一种怀疑的精神,比如笛卡尔,他最终逐本溯源提出"我思故我在"

耶鲁公开课 - 欧洲文明课程节选

And you'll find too because of J term this year or winter break where you guys can finally come back onto campus a bit early for various opportunities.

你还会发现由于今年的J学期或寒假,大家可以早点返回校园,这会带来各种机会。

哈佛公开课 - 计算机科学课程节选